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20130318
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here in germany. it is freezing. probably a good time to have an energy-efficient home or apartment. >> there are lots of creative ways of doing it. the latest trends are being presented right now in germany. >> we decide to take a look at one way to go green, literally. it involves something that you might not expect for heating. algae. >> scientists spent five years trying to find an algae culture that could be used to heat buildings. martin developed the system and now they are launching the test phase. >> we do not have any prior experience. we are kind of writing the book. >> the algae building is a world premiere, but growing algae could soon set a precedent for others because the algae only need a few nutrients, carbon dioxide, and some might in order to produce heat and valuable bio mass. >> if we take a look at our efficiencies, you could say we went back 10% of the night as biomass and harnessed 38% as heat. that's means i recover 48% of the light absorbed by the algae. in solar cells, it is only around 12% to 15%. >> and construction materials and energy systems are key t
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